We tested the latest Devart dlls (7.2.96.0) and the AccessViolation issue seems to be resolved.
However, while testing we came across follow defect.

When we add any 'CHAR' parameter to query, the query returns empty result set even if there are records available.
I tried changing the OracleDBType from 'CHAR' to 'VarChar', the same query returned the expected results. This is happening with latest DevArt DLLs only.

Below is the code snippet to build the command object with parameterized query.

We are going to send you the internal build of dotConnect for Oracle with both fixes ("the CHAR parameter when Unicode=true" and "connection pool is not getting cleared on AppDomain unload") in the beginning of the next week.